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SUMMARY:Statistics of passive vectors in an unstable periodic flow of Coue
 tte system - Kida\, S (Kyoto)
DTSTART:20080911T105000Z
DTEND:20080911T111000Z
UID:TALK13374@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The statistics of orientation and location of passive vectors 
 in an unstable periodic flow of Couette system are investigated numericall
 y with special attention to the correlation with the coherent structures i
 n the flow. The flow domain is divided into many small cubic regions and t
 he distribution of directions of many passive vectors in each cube is calc
 ulated at several temporal phases of the unstable periodic flow. It is fou
 nd that in most of cubes the passive vectors align either in a single dire
 ction (linear region) or on a plane (planar region). The unstable periodic
  flow exhibits the characteristic features of Couette turbulence having th
 e streamwise vortices and the low-speed streaks. The linear regions are ob
 served in streamwise vortices and low-speed streaks (or the ejection regio
 n near the wall)\, the planar regions in the periphery of vortices and in 
 the sweep region near the wall. The dispersion in direction of passive vec
 tors depends on their near-past history over the characteristic times of t
 he unstable periodic flow.
LOCATION:Seminar Room 1\, Newton Institute
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